Yeah, I appreciate it's not always easy. Some thoughts: nobody should be telling management "it's done" until code review is complete (which is true, and when you do otherwise management want to push you on to the next task because they won't understand the difference), tasks should be ready for code review a couple of days before deadlines and not on the deadline, and you need to educate management that when they push unrealistic deadlines where code review is skipped then they take on a large part of the responsibility for bugs that appear now and in the future.

In other words, they need to understand that code review isn't some bonus additional task but a vital part of healthy projects.